And cutting off machine



3 Sheets-Sheet 1.

(No Model.) Q A. W. CASH.

I PIPE THRBADING AND CUTTING OPP MACHINE. No. 519,175. Patented May1,1894.

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(No Modem s Sheets-Sheet 2.

A. W. CASH. PIPE THREADING- AND CUTTING OFF MACHINE.

Ill "HU INVENTOR WITNESSES (No Model.) 3 Sheets-Sheet 3.

A. W. CASH. PIPE THRBADING AND CUTTING OFF MACHINE. No. 519,175.Patented May 1, 1894.

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Urrs STATES ATENT OFFICE.

ARTHUR W. CASH, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE ARMSTRONGMANUFACTURING COMPANY, OF SAME PLACE.

PIPE THREADING AND CUTTING-OFF MACHINE.

SPECIFICATION forming part of Letters Patent No. 519,175, dated May 1,1894.

Application filed August 14,1893. Serial No. 483,088. (No model.)

able others skilled in the art to which it appertains to make and usethe same.

My invention has for its object to simplify, cheapen and at the sametime to generally improve the construction and operation of thisclass ofmachines. With these ends in view I have devised a novel pipe threadingand cutting off machine in which the pipe to be held is gripped andcarried by jaws in a rotating head, the head and pipe having however nolongitudinal movement, and the dies and cutter are placed upon aslidingcarriage but have no rotary movement. This construe tion enables me tosimplify the construction of the machine in many respects, gives readyaccess to the dies so that dies may be re moved and replaced withoutappreciable loss of time and without the requirement for a skilledmechanic, and furthermore enables me toprovide a simple and easilyoperated gage for standard sizes of pipe, said gage moreover beingcapable of ready adjustment so as to cut a thread either slightly overor slightly under the standard size. These results I accomplish by thenovel construction which I will now describe referring by numbers to theaccompanying drawings forming part of this specification, in which-Figure 1 is a plan view of my novel machine complete; Fig.2 a sideelevation; Fig. 3 a section on theline a: or in Fig. 1; Fig. 4a similarsection with the face plate removed,

1 and Fig. 5 is an end elevation of the rotating head showing thegripping jaws.

1 denotes the bed which is supported by a suitable base 2. The pipe tobe threaded, not shown in the drawings, is carried by heads 3 and 4 upona hollow mandrel 5 itself journaled in boxes 6. The pipe is lockedfirmly against turning while being threaded by serrated jaws 7 carriedby slides 8 in head 3.

These slides carrying the jaws with them are plied by belts, not shown,running over either of the belt pulleys 13. Motion is communicated fromshaft 12 to the hollow mandrel by means of gearing within a housing 14,said gearing being indicated by dotted lines only in Fig. 2. I

15 denotes a die carriage which is adapted to slide longitudinally onthe bed, the movement of said carriage being controlled by a hand lever16 pivoted to the carriage and having a slot 17 at its end whichreceives a pin 18 extending upward from the bed and passing through aslot 19 in the carriage. This pin which may be changed from one hole toanother in the bed, see 20, Fig. 1, serves as the fulcrum for the handlever.

21 denotes the threading dies and 22 the cutting off tool, both of whichare carried by transverse slides 23 upon the die carriage.

The shape of the threadingdies is clearly shown in Fig. 4. They are madereversible that is provided with cutters on each edge. These dies lie inrecesses 24 in the slides and rest against stumps 25 which support themand take up the thrust. They are held in the socket by face plates 26,see Fig. 1, and may be readily adjusted and replaced in a moments timewithout taking the machine apart. The cutting off tool is recessed intoone of the face plates and is held in position by a slide 27 itself heldby a plate 28 bolted to the top of the slide. The slides carrying thedies are moved in and out by means of right and left threaded screws 29which ongage bosses 30 on the slides. The outer ends of these screws aresupported in the die carriage and each screw is provided with a gearwheel 31 which is engaged by a pinion 32, see dotted lines Figs. 3 and 4on a shaft 33 which is provided with a crank 34 for convenience inoperation.

In order to provide an instant and accurate adjustment for the dies insetting them to place for threading or cutting off pipe I pro vide aswinging gage 35 which is pivoted to one of the slides as at 36 and isprovided with a plurality of engaging surfaces, in the present instancethree, which are adapted toengage a hub 37 upon the other slide for thepurpose of stopping the movement of the slldes at the exact positionrequired to thread or cut off. the special size of pipe which it may bedesired to operate upon. The outer end of hub 37 is provided with adepression or socket, see dotted lines Fig. 1, the purpose of which willpresently be explained.

As it is frequently required to make a thread slightly over or slightlyunder standard size upon pipes of standard size I make the engagingsurface which I designate by 38, adjustable. In the present instance Ihave shown these engaging surfaces as consisting of bolts having roundedheads which are adapted to engage the depression in the outer end of hub37. These engaging surfaces are adjusted to the exact position requiredto cut standard threads and are then looked there by set nuts 39 on thebolts. I have shown a gage provided with three engaging surfaces andconsequently adapted to set the dies in position to cut three standardsizes of thread or to cut off three standard sizes of pipe. Any numberof engaging surfaces may of course be provided. The use of this gagewill be apparent from Fig. 1. It

is simply necessary to place the special engaging surface correspondingto the thread to be cut in position to engage hub 37 and then turn crank34 until the engaging surface and head are in engagement, as clearlyshown in Fig. 1. Suppose now that it is desired to cut a thread slightlyover or slightly under standard size. The set nut upon the boltconstituting the engaging surface corresponding to the normal threadwould be loosened and the bolt would be turned in or out slightly asmightbe required to cause the dies to approach each other a trifle moreclosely, or to stop them, before they had quite reached the position tocut a normal thread, after which the bolt would be locked in position bytightening up the set nut.

Having thus described my invention, I claim 1. In combination with theslides carrying dies, a lever pivotally connected to one slide andhaving a plurality of bearing surfaces for engaging the other die,substantially as described.

2. In combination with the slides carrying dies and means for movingthem toward and from each other, a lever pivotally connected to oneslide and having a freely swinging stepped end and adjustable bearingpieces carried by said stepped end, substantially as described.

3. The combination with slides 23,dies carried thereby, and right andleft threaded screws by which said slides are moved in or out, one ofsaid slides having a hub 37, of a swinging gage pivoted to the slideopposite to hub 37 said gage having a plurality of en gaging surfaces,either of which is adapted to engage hub 37 to set the dies in position.

In testimony whereof I affix my signature in presence of two witnesses.

ARTHUR W. CASH.

Witnesses:

A. M. WOOS'IER, PEARL REYNOLDS.

